IN: Which person is he?
William enforced a mandatory choir practice for Ryan since he is struggling with his singing abilities.
OUT: Ryan

IN: Which person is they?
Treasure hunters have to constantly fear running into bandits because they could be risking their lives if they encounter them.
OUT: Treasure hunters

IN: Which person is he?
John picked Bill because he was in need of talent.
OUT: John

IN: Which person is he?
John picked Bill because he was talented.
OUT:
Bill